ACCIDENTS, DISEASES, PARASITES, 



189 



Indian Territory and the Missouri State, and on a few vines 

 in the Wyandotte district. The existence of this fungus 

 in the latter district where 

 European vines were never im- 

 ported would prove, according 

 to Viala, that the disease is of 

 American origin. It has never 

 been found in the northern and 

 southern states of the Union 

 where European vines are fre- 

 quently imported. The disease 

 is called white-rot in America, 

 and Viala suggested the reten- 

 tion of this name in France. 

 This disease is not as dangerous 

 as black-rot, and the damage 

 caused by it was located to a 

 few vineyards only of the Gard 

 and Herault. 



Coniotkyrium is formed, like 



the black-rot, by a mycelium 



penetrating the tissues of the 



portion of the plant upon which 



the pycnidia germinate. These 



pycnidia, or conceptacles, con- 

 tain spores (stylospores). This 



is, therefore, also a fungus 



living in the shelter of the 



organs destroyed by it, and 



preventive means only are 



effective. The liquid cupric 



compounds used against mildew 



and black-rot gave SatisfactorV Transparent Colourless Mycelium Fill 



results, and it would appear *-* 

 that the almost complete dis- 

 appearance of this fungus since 1887 is due to the treatment 

 against mildew.* 



(F.) POUERIDIE. 



Pourridie has been known in Europe for a very long 

 time. Fruit and forest trees are affected by it. Affected 



Fig. 155. 



* Me moire sur le Coniothyrium diplodiella, in Annales de VEcole Rationale d' Agri- 

 culture de Montpellier, VolIIl., p. 304. 



